Display device

ABSTRACT

The present disclosure provides a display unit of a display device. The display unit emits an output light under an operation of the highest gray level, the output light having an output spectrum, an intensity integral of the output spectrum from 380 nm to 470 nm defines as a first intensity integral, an intensity integral of the output spectrum from 580 nm to 780 nm defines as a second intensity integral, a ratio of the first intensity integral over the second intensity integral defines as a first ratio, and the first ratio is greater than 0% and less than or equal to 2.5%.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation application of U.S. patentapplication Ser. No. 15/619,552 filed Jun. 12, 2017 which claims thebenefit of U.S. Provisional Application Ser. No. 62/462,999, filed Feb.24, 2017 and U.S. Provisional Application Ser. No. 62/479,326, filedMar. 31, 2017, the contents of which are hereby incorporated byreference in their entirety.

BACKGROUND OF THE INVENTION 1. Field of the Invention

The present disclosure relates to a display device, and moreparticularly to a display device capable of generating red light whichhas a color close to the red primary color of DCI-P3 color gamut.

2. Description of the Prior Art

Display devices are configured to convert acquired or stored electricinformation into visual information and display it to a user. The colorgamut of display devices, such as liquid crystal display (LCD), arereferenced to NTSC (National Television System Committee) color gamut.With the advance of technology, in order to meet different color systemsand display various colors, different color gamuts, such as sRGB, DCI(Digital Cinema Initiatives)-P3 and Rec. 2020 (ITU-R RecommendationBT.2020), have been defined. The DCI-P3 color gamut is one of thepopular color gamuts and is widely applied to various digital monitorsor TV.

However, the color temperature of the white light generated from adigital monitor, such as a laptop computer monitor or a desktop computermonitor, is usually less than that generated from a TV, which means thewhite light of the digital monitor is more reddish than that of the TV,thereby resulting in uncomfortableness of the user. Traditional methodfor adjusting color temperature or color tone is to change the spectrumof the light generated from a light-emitting material. Accordingly, tochange the color temperature of the display device is complicated andalso takes much time, thereby burdening the manufacturing cost.

SUMMARY OF THE INVENTION

It is one of the objectives of the present disclosure to provide adisplay device capable of generating an output light which has a colortemperature the same as the color temperature generated from the TV toimprove the visual perception of the user.

According to an embodiment of the present disclosure, a display deviceis provided. A display unit of the display device includes a lightemitting unit and a light converting layer disposed on the lightemitting unit. The display unit emits an output light under an operationof the highest gray level, the output light having an output spectrum,an intensity integral of the output spectrum from 380 nm to 470 nmdefines as a first intensity integral, an intensity integral of theoutput spectrum from 580 nm to 780 nm defines as a second intensityintegral, a ratio of the first intensity integral over the secondintensity integral defines as a first ratio, and the first ratio isgreater than 0% and less than or equal to 2.5%.

According to another embodiment of the present disclosure, a displaydevice is provided. The display device includes a backlight unit, alight modulating layer, a light converting layer, and a firstpolarization layer. The light modulating layer is disposed on thebacklight unit. The light converting layer is disposed on the backlightunit. The first polarization layer is disposed between the lightmodulating layer and the light converting layer. A display unit isformed of at least a portion of the backlight unit, at least a portionof the light modulating layer, at least a portion of the lightconverting layer, and at least a portion of the first polarizationlayer, wherein the display unit emits an output light under an operationof the highest gray level, the output light having an output spectrum,an intensity integral of the output spectrum from 380 nm to 470 nmdefines as a first intensity integral, an intensity integral of theoutput spectrum from 580 nm to 780 nm defines as a second intensityintegral, a ratio of the first intensity integral over the secondintensity integral defines as a first ratio, and the first ratio isgreater than 0% and less than or equal to 2.5%

In the display device of the present disclosure, the first ratio can beadjusted easily by the thickness of the first converting layer or thearea of the second layer to be greater than 0% and less than or equal to2.5%, so that the color temperature of the display device can be easilyadjusted to be the same as the color temperature generated from the TV,thereby improving the visual perception of the user and saving themanufacturing cost.

These and other objectives of the present invention will no doubt becomeobvious to those of ordinary skill in the art after reading thefollowing detailed description of the preferred embodiment that isillustrated in the various figures and drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram illustrating a display unit according toan embodiment of the present disclosure.

FIG. 2 is a schematic diagram illustrating the input spectrum of theinput light.

FIG. 3 is a schematic diagram illustrating the output spectrum of theoutput light.

FIG. 4 is an enlarged schematic diagram of a first wave shown in FIG. 3.

FIG. 5 is a CIE 1931 xy chromaticity diagram illustrating points of theoutput spectrums of the output lights with different first ratios anddifferent second ratios, the DCI-P3 color gamut and the CIE 1931 colorspace.

FIG. 6 is an enlarged schematic diagram illustrating different firstwaves with different first ratios corresponding to the points shown inFIG. 5 while the intensity of the second intensity peak of thecorresponding second wave is 100%.

FIG. 7 is a schematic diagram illustrating a display device according tothe first embodiment of the present disclosure.

FIG. 8 is a schematic diagram illustrating a display unit according to afirst variant embodiment of the first embodiment of the presentdisclosure.

FIG. 9 is a schematic diagram illustrating a display unit according to asecond variant embodiment of the first embodiment of the presentdisclosure.

FIG. 10 is a schematic diagram illustrating a display unit according toa third variant embodiment of the first embodiment of the presentdisclosure.

FIG. 11 is a schematic diagram illustrating a display unit according toa fourth variant embodiment of the first embodiment of the presentdisclosure.

FIG. 12A to FIG. 12D are schematic diagrams illustrating top views ofthe display device according to a fifth variant embodiment to an eighthvariant embodiment of the first embodiment of the present disclosure.

FIG. 13 is a schematic diagram illustrating a display device accordingto a ninth variant embodiment of the first embodiment of the presentdisclosure.

FIG. 14 is a schematic diagram illustrating a display device accordingto a second embodiment of the present disclosure.

FIG. 15 is a schematic diagram illustrating a display device accordingto a variant embodiment of the second embodiment of the presentdisclosure.

DETAILED DESCRIPTION

The present disclosure may be understood by reference to the followingdetailed description, taken in conjunction with the drawings asdescribed below. It is noted that, for purposes of illustrative clarity,certain elements in various drawings may not be drawn to scale.

It will be understood that when an element is referred to as being “on”another layer or substrate, it can be directly on the other element, orintervening elements may also be present. It will be understood that,although the terms first, second, third etc. may be used herein todescribe various elements, components, sub-pixels, units, and/or layers,these elements, components, sub-pixels, units and/or layers should notbe limited by these terms. These terms are used to distinguish oneelement, component, sub-pixel, unit and/or layer from another element,component, sub-pixel, unit and/or layer.

Refer to FIG. 1, which is a schematic diagram illustrating a displayunit of a display device according to an embodiment of the presentdisclosure. The display unit 10 includes a first light emitting unit 12and a first light converting layer 14. The display unit 10 could emit anoutput light OL. The first light converting layer 14 is disposed on thefirst light emitting unit 12. Specifically, an input light IL with aninput color emitted from the first light emitting unit 12 is incidentonto the first light converting layer 14, and the first light convertinglayer 14 can convert the input light IL (with input spectrum) into theoutput light OL (with output spectrum). The first light converting layer14 can absorb a part of the input light IL and convert the part of theinput light IL into a converted light CL with a converted colordifferent from the input color. Other part of the input light IL that isnot absorbed by the first light converting layer 14 will penetratethrough the first light converting layer 14. Accordingly, the convertedlight CL and the other part of the input light IL can be mixed with eachother to form the output light OL emitted from the first lightconverting layer 14, and the output color of the first light convertinglayer 14 can be formed by mixing an input color of the input light ILand the converted color of the converted light CL. The main wavelengthrange of the input light IL should be less than the main wavelengthrange of the converted light CL, so the input light IL can be absorbedby the first light converting layer 14 and be converted into the outputlight OL. Furthermore, the output light OL has an output spectrum underan operation of a highest gray level. For example, for an 8-bit-deepimage, the highest gray level may be 255, but not limited thereto.

In this embodiment, the first light emitting unit 12 may include aself-emissive blue light emitting diode, such as micro-sized lightemitting diode (inorganic, called micro-LED) or organic light emittingdiode (OLED), so that the input light IL emitted from the first lightemitting unit 12 can be directly turned on or off by a switchelectrically connected to the first light emitting unit 12, such asthin-film transistor (TFT), but not limited thereto, and the first lightemitting unit 12 may be other kinds of self-emissive light emittingdiodes. Also, a number of the micro-LED in the first light emitting unit12 is not limited to be one, and may be plural. For example, the displayunit 10 may include a substrate with a concavity. Since the size of themicro-LED is about micrometer-scale or smaller, at least one micro lightemitting diode, for example two or three micro light emitting diodesgenerating similar spectrum, may be disposed in the concavity.

The first light converting layer 14 may include a quantum dot material,a color filter material or a phosphor material, or combination of atleast two of those materials. When the first light converting layer 14includes the quantum dot material, the first light converting layer 14may include a plurality of quantum dots 14 a. The quantum dot materialis made of a semiconductor nano-crystal structure, and can be any oneselected from CdSe, CdS, CdTe, ZnSe, ZnTe, ZnS, HgTe, InAs,Cd_(1-x)Zn_(x)Se_(1-y)S_(y), CdSe/ZnS, InP, and GaAs.

Refer to FIG. 2, which is a schematic diagram illustrating the inputspectrum of the input light. The input spectrum has a wave, in which thewave has an intensity peak (local maximum intensity) and a FWHM (FullWidth at Half Maximum). The intensity peak of the input spectrum rangesfrom 448 nm to 450 nm, and the FWHM of the input spectrum may range from10 nm to 30 nm, for example ranges from 17 nm to 19 nm. Accordingly, theinput color of the input light may be blue.

Refer to FIG. 3 and FIG. 4. FIG. 3 is a schematic diagram illustratingthe output spectrum of the output light, and FIG. 4 is an enlargedschematic diagram of a first wave shown in FIG. 3. Since the outputlight OL is emitted by mixing the converted light CL with the convertedcolor and the other part of the input light IL with the input color, theoutput spectrum of the output light OL may include a first wave W1(main) and a second wave W2 (sub). The first wave W1 may represent theother part of the input light IL that penetrates through the first lightconverting layer 14, and may ranges from 380 nm to 470 nm. The firstwave W1 has a first intensity peak P1 that is a maximum peak of theoutput spectrum from 380 nm to 470 nm. Accordingly, the first wave W1may correspond to blue light. Because a large part of the input light ILis absorbed by the first light converting layer 14, the first intensitypeak P1 is slightly different from the intensity peak of the inputspectrum and ranges from 445 nm to 447 nm. The second wave W2 mayrepresent the converted light CL generated from the first lightconverted layer 14, and may ranges from. 580 nm to 780 nm. Accordingly,the second wave W2 may correspond to red light. The second wave W2 has asecond intensity peak P2 that is a maximum peak of the output spectrumfrom 580 nm to 780 nm and ranges from 633 nm to 639 nm. Since a majorpart of the input light IL is absorbed by the first light convertinglayer 14, the intensity of the second intensity peak P2 is much greaterthan the intensity of the first intensity peak P1, and the output colorof the output light OL can be similar to but not the same as the redconverted color of the converted light CL. Also, through having thefirst wave W1 with less intensity, the output color may be slightlybluish. In this embodiment, there is no wave between the first wave W1and the second wave W2, so the red color of the second wave W1 is notmixed with other color except the blue color of the first wave W1.

Specifically, an intensity integral of the output spectrum from 380 nmto 470 nm, which is the intensity integral of the first wave W1, definesas a first intensity integral I1. The first intensity integral I1 mayrepresent the energy of the other part of the input light IL that is notabsorbed by the first light converting layer 14. An intensity integralof the output spectrum from 580 nm to 780 nm, which is the intensityintegral of the second wave W2, defines as a second intensity integral12. The second intensity integral 12 may represent the energy of theconverted light CL. A ratio of the first intensity integral I1 over thesecond intensity integral 12 (I1/I2) in the optical spectrum defines asa first ratio. The output color of the output light OL can be determinedbased on the first ratio. In this embodiment, the first ratio is greaterthan 0% and less than or equal to 2.5%. For example, the first ratio maybe less than or equal to 1.7%. Furthermore, a ratio of the firstintensity peak P1 over the second intensity peak P2 (P1/P2) defines as asecond ratio, and the second ratio can be greater than 0% and less thanor equal to 5.5%. Also, the wavelengths of the second wave W2 at theFWHM may be for example 610 nm and 660 nm, so the FWHM of the secondwave W2 may be for example 50 nm. When the first light converting layer14 is formed of the quantum dots 14a, the size of each quantum dot 14 amay for example range from 4 nm to 6 nm.

Refer to FIG. 5 and FIG. 6 as well as Table 1. FIG. 5 is a CIE 1931 xychromaticity diagram illustrating points of the output spectrums of theoutput lights with different first ratios and different second ratios,the DCI-P3 color gamut and the CIE 1931 color space, and FIG. 6 is anenlarged schematic diagram illustrating different first waves withdifferent first ratios corresponding to the points shown in FIG. 5 whilethe intensity of the second intensity peak of the corresponding secondwave is 100%. The x-coordinate values and y-coordinate values of thepoints, the shifts Δx and Δy from the point DCIR to the points, thecorresponding first ratios, and the corresponding second ratios arelisted in the following Table 1. A curve CIE represents a boundary ofthe CIE 1931 color space; a region R represents the DCI-P3 color gamut,in which a point DCIR represents the red primary color thereof; a blockR1 represents a color with a shift of 0.020 from the point DCIR inx-coordinate or in y-coordinate; and a block R2 represents a color witha shift of 0.010 from the point DCIR in x-coordinate or in y-coordinate.The point DCIR has an x-coordinate value and a y-coordinate value of(0.680, 0.320), which is on the curve CIE. A point KO representing thecolor of the second wave W2 with no first wave W1 is on the curve CIE.The point KO is inside the block R1, so the point KO is close to thepoint DCIR enough to show almost the same color as the point DCIR. Also,the points K1 to K8 correspond to output spectrums C1 to C8respectively, in which the output spectrum C1 represents the conditionof the first ratio being 0.1%; the output spectrum C2 represents thecondition of the first ratio being 0.3%; the output spectrum C3represents the condition of the first ratio being 0.4%; the outputspectrum C4 represents the condition of the first ratio being 0.6%; theoutput spectrum C5 represents the condition of the first ratio being0.7%; the output spectrum C6 represents the condition of the first ratiobeing 1.0%; the output spectrum C7 represents the condition of the firstratio being 1.4%; and the output spectrum C8 represents the condition ofthe first ratio being 1.7%. Based on the above-mentioned, when the firstratio is greater than 0% and equal to or less than 2.5% or the secondratio is greater than 0% and equal to or less than 5.5%, the color ofthe points K1 to K8 may be adjusted to be slightly bluish, and at thesame time, the color of the points K1 to K8 is still close to the pointDCIR enough to be used as a red light source, such as red sub-pixel. Forexample, the color of the points K1 to K8 can be inside the block R2. Itshould be noted that because the first wave W1 is from the input light,the output color of the output light OL can be adjusted to be slightlybluish to match the requirements. For example, when the display unit 10is used as the red sub-pixel, the white color generated from the redsub-pixel, a blue sub-pixel and a green sub-pixel can be slightlyshifted to be bluish, thereby increasing the color temperature thereof.Accordingly, the color temperature of a display device using the displayunit 10 can be the same as the color temperature generated from the TVby adjusting the first ratio so as to improve the visual perception ofthe user.

TABLE 1 point K8 K7 K6 K5 K4 K3 K2 K1 K0 first ratio 1.7% 1.4% 1.0% 0.7%0.6% 0.4% 0.3% 0.1% 0.0% second ratio 4.7% 3.8% 2.8% 1.9% 1.5% 1.1% 0.8%0.4% 0.0% x 0.661 0.666 0.670 0.675 0.677 0.679 0.681 0.682 0.684 y0.302 0.304 0.307 0.310 0.311 0.312 0.313 0.314 0.315 Δx −0.019 −0.014−0.010 −0.005 −0.003 −0.001 0.001 0.002 0.004 Δy −0.018 −0.016 −0.013−0.010 −0.009 −0.008 −0.007 −0.006 −0.005

The above-mentioned display unit 10 may be used as a sub-pixel of adisplay device. Refer to FIG. 7, which is a schematic diagramillustrating a display device according to the first embodiment of thepresent disclosure. The display device 100 may include a plurality ofpixels PX, and each pixel PX may include at least two sub-pixels. Inthis embodiment, the pixel PX includes three sub-pixels, and one of thethree sub-pixels of each pixel PX may be a red sub-pixel SPX1 that usesthe above-mentioned display unit 10. Specifically, the red sub-pixelSPX1 may include the first light emitting unit 12 and the first lightconverting layer 14 so as to generate the first output light OL1 withthe red output color close to the red primary color of DCI-P3 colorgamut that meets the requirements. Also, the other two sub-pixels ofeach pixel PX may respectively be a green sub-pixel SPX2 and a bluesub-pixel SPX3, but not limited thereto. The green sub-pixel SPX2 mayinclude a second light emitting unit 22 and a second light convertinglayer 24 disposed on the second light emitting unit 22. For example, thesecond light emitting unit 22 may be the same as the first lightemitting unit 12, which is a blue light emitting diode, but not limitedthereto. The second light converting layer 24 may include a quantum dotmaterial, a color filter material or a phosphor material. The secondlight converting layer 24 can be used to absorb the light generated fromthe second light emitting unit 22 and generate another converted light,so that a second output light OL2 can be emitted from the second lightconverting layer 24. As compared with the first light converting layer14, the converted light generated from the second light converting layer24 is green. For example, the peak wavelength of the second lightconverting layer 24 may ranges from 525 nm to 535 nm, and when thesecond light converting layer 24 includes quantum dots, the size of eachquantum dot may be for example 3.3 nm, but not limited thereto. Also, inorder to emit green light, the second light converting layer 24 shouldabsorb most of or all of the input light, so that the color of theoutput light OL2 from the second converting layer 24 can be close to orthe same as the green primary color of DCI-P3 color gamut.

Additionally, the blue sub-pixel SPX3 may include a third light emittingunit 32. For example, the third light emitting unit 32 may be the sameas the first light emitting unit 12, which is a blue light emittingdiode, but not limited thereto. When the third light emitting unit 32meets the requirements, the blue sub-pixel SPX3 may not include lightconverting layer. If some requirements are needed, the blue sub-pixelSPX3 may selectively include a third light converting layer 34 disposedon the third light emitting unit 32. The third light converting layer 34may include a quantum dot material, a color filter material or aphosphor material. The third light converting layer 34 can also be usedto change the blue light of the third light emitting unit 32 to be closeto the blue primary color of the DCI-P3 color gamut. For example, whenthe third light converting layer 34 is formed of the quantum dots, thesize of each quantum dot may range from 2 nm to 3 nm. Also, theintensity peak of the converted light of the third light convertinglayer 34 may range from 522 nm to 524 nm, and the FWHM of the convertedlight of the third light converting layer 34 may range from 20 nm to 60nm, for example range from 35 nm to 37 nm. The thickness of the thirdlight converting layer 34 may be less than the thickness of the firstlight converting layer 14 and the thickness of the second lightconverting layer. It will be understood that the display device 100 mayfurther include other display elements, such as data lines, scan lines,TFTs, electrodes, substrates, polarization layers, optical films,insulating layers, encapsulation layers, or other elements or layers.

The display device is not limited by the aforementioned embodiment, andmay have other different variant embodiments or embodiments. To simplifythe description, the identical components in each of the followingvariant embodiments or embodiments are marked with identical symbols.For making it easier to compare the difference between the firstembodiment and the variant embodiment and the difference between thefirst embodiment and other embodiments, the following description willdetail the dissimilarities among different variant embodiments orembodiments and the identical features will not be redundantlydescribed. The display unit may include at least a portion of elementsor layers, for example the red sub-pixel SPX1 may include the firstlight emitting unit 12, the first light converting layer 14, and aportion of a corresponding polarization layer. The shift effect of firstratio, second ratio, and color hue (x-coordinate value, y-coordinatevalue) by those elements and layers may be ignorable, and the dominanteffective factor are the light emitting unit and the light convertinglayer. The output light could be regarded as the final visual light ofthe display device to the user (observer).

Refer to FIG. 8, which is a schematic diagram illustrating a displayunit according to a first variant embodiment of the first embodiment ofthe present disclosure. As compared with the first embodiment, the firstlight converting layer 141 may include a multilayer structure.Specifically, the multilayer structure may include a plurality ofquantum dot layers 141L stacked in sequence, in which each quantum dotlayer 141L includes a plurality of quantum dots 141 a. The thickness ofthe first light converting layer 141 may be adjusted by the number ofthe quantum dot layers 141L, thereby adjusting the first ratio. Thequantum dots 141 a maybe substantially the same as the quantum dots ofthe first light converting layer in first embodiment and will not beredundantly detailed.

Refer to FIG. 9, which is a schematic diagram illustrating a displayunit according to a second variant embodiment of the first embodiment ofthe present disclosure. As compared with the first embodiment, the firstlight converting layer 142 of this variant embodiment may furtherinclude at least one pigment material. Specifically, the first lightconverting layer 142 may include a plurality of pigment particles 142 awhich can filter and absorb light of a specific wavelength range.Accordingly, through the pigment particles, the first intensity integralof the first wave may be changed or reduced to adjust or lower the firstratio. In other words, because of the pigment particles 142 a, athickness of the first light converting layer 142 may be less than thatof the first embodiment while the first ratio of this variant embodimentis the same as the first embodiment. Depending on the characteristic ofthe pigment material of the pigment particles 142 a, the first intensitypeak of the first wave maybe slightly changed or not. A size of each ofpigment particles 142 a, for example 50 nm, is greater than the size ofeach quantum dot 14 a. For instance, the pigment material may includepurple pigment V23, blue pigment B15:6, green pigment G36, green pigmentG58, yellow pigment Y150, red pigment R177 or red pigment 254, but notlimited thereto. In another variant embodiment, the pigment particles142 a may be formed of a plurality of pigment materials, such as two orthree pigment materials, and the pigment materials may include at leasttwo of the above-mentioned pigment materials, such as a combination ofgreen pigment G36 and red pigment 254, but not limited thereto.

Refer to FIG. 10, which is a schematic diagram illustrating a displayunit according to a third variant embodiment of the first embodiment ofthe present disclosure. The first light converting layer 143 of thisvariant embodiment may include a first layer L1 and a second layer L2stacked on the first layer L1, in which the first layer L1 includes aquantum dot material, and the second layer L2 includes at least onepigment material. In this variant embodiment, the second layer L2doesn't cover the first layer L1, and a width of the second layer L2 isless than a width of the first layer L1. Specifically, the first layerL1 may include a plurality of quantum dots 143 a, and the second layerL2 may include a plurality of quantum dots 143 b and a plurality ofpigment particles 143 c. Also, the first light converting layer 143 mayfurther include a transparent layer L3 disposed on (stacked on) thefirst layer L1, the transparent layer L3 is adjacent to the second layerL2, and a combination of the second layer L2 and the transparent layerL3 covers the first layer L1. A top surface of the second layer L2 maybe leveled with a top surface of the transparent layer L3. In anothervariant embodiment, the pigment particles 143 b may be formed of aplurality of pigment materials. In still another variant embodiment, thesecond layer L2 may not include the quantum dots 143 b. In anotherembodiment, the second layer L2 may not be stacked on the first layerL1, and the second layer L2 may be disposed aside the first layer L1. Inanother embodiment, the first light converting layer 143 may include aplurality of first layers L1 and a plurality of second layers L2, andeach first layer L1 and each second layer L2 are alternately stacked.

Refer to FIG. 11, which is a schematic diagram illustrating a displayunit according to a fourth variant embodiment of the first embodiment ofthe present disclosure. In the first light converting layer 144 of thefourth variant embodiment, the second layer L2 may include a pluralityof portions P separated from each other, and each portion P includes aplurality of quantum dots 143 b and a plurality of pigment particles 143c. For example, the portions P maybe disposed near or on the edges ofthe first layer L1 respectively. In another variant embodiment, eachportion P may not include the quantum dots 143 b.

Refer to FIG. 12A to FIG. 12D, which are a schematic diagramsillustrating top views of the display device according to a fifthvariant embodiment to an eighth variant embodiment of the firstembodiment of the present disclosure. As shown in FIG. 12A, in thesub-pixel SPX1 a of the fifth variant embodiment, a first area of thefirst layer L1 that is not covered with the second layer L2 may be thesame as a second area of the second layer L2. Also, a separate line forseparating the first area and the second area may be along a directionof a short edge of the sub-pixel SPX1 a. As shown in FIG. 12B, in thesub-pixel SPX1 b of the sixth variant embodiment, the separate line forseparating the first area and the second area may be along a directionof a long edge of the sub-pixel SPX1 b. As shown in FIG. 12C, in thesub-pixel SPX1 c of the seventh variant embodiment, the separate linefor separating the first area and the second area may be along adiagonal line of the sub-pixel SPX1 c. As shown in FIG. 12D, in thesub-pixel SPX1 d of the eighth variant embodiment, the second layer L2may include two portions P, and the first area of the first layer L1 mayalso be divided into two sub-areas SA. The portions P of the secondlayer L2 and the regions of the first layer L1 may be separated by twodiagonal lines of the sub-pixel SPX1 d.

Refer to FIG. 13, which is a schematic diagram illustrating a displaydevice according to a ninth variant embodiment of the first embodimentof the present disclosure. As compared with the first embodiment, thedisplay device 110 of this variant embodiment further includes aninsulation layer IN covering the pixels PX. The insulation layer IN maybe formed of an organic material, such as photoresist material, or aninorganic material, such as silicon nitride or silicon oxide. When theinsulation layer is formed of organic material, the insulation layer INmay be easy to flatten the top surface of the insulation layer IN. Whenthe insulation layer IN is formed of inorganic material, the insulationlayer IN may have better resistance, which helps to apply to touchdevices. In another variant embodiment, the insulation layer IN may beformed of multilayer structure, and the multilayer structure may be astack of the organic material and the inorganic material.

Refer to FIG. 14, which is a schematic diagram illustrating a displaydevice according to a second embodiment of the present disclosure. Asshown in FIG. 14, the display device 200 may include a backlight unitBU, a light modulating layer LM, a first light converting layer 14 and afirst polarization layer PL1. The light modulating layer LM may be forexample a liquid crystal layer or a liquid crystal panel used formodulating the liquid crystal of the sub-pixels to different refractivestates. It will be understood that the display device 200 may furtherinclude other display elements, such as data lines, scan lines, TFTs,substrates, optical films, insulating layers, encapsulation layers, orother elements to control the switches of the pixels. Specifically, thedisplay device 200 may include a film F which includes a plurality ofthe first light converting layers 14, a plurality of the second lightconverting layers 24 and a plurality of third light converting layers34. Each first light converting layer 14, each second light convertinglayer 24 and each third light converting layer 34 may be arrangedalternately, and there is a black matrix BM may disposed between any twoadjacent light converting layers. In other words, the first lightconverting layers 14, the second light converting layers 24, the thirdlight converting layers 34 and the black matrix BM may form the film F.In other embodiments, the black matrix BM could be replaced by stackedlight converting layers, or there is no the black matrix BM. In thisembodiment, the film F is disposed on the backlight unit BU, and thefirst polarization layer PL1 and the light modulating layer LM isdisposed between the backlight unit BU and the film F, in which thefirst polarization layer PL1 is disposed between the light modulatinglayer LM and the first light converting layer 14. The display device 200may further include a second polarization layer PL2 disposed between thelight modulating layer LM and the backlight unit BU, so that the lightmodulating layer LM is disposed between the first polarization layer PL1and the second polarization layer PL2. The input light emitted from thebacklight unit BU can be converted into output lights respectively byeach first light converting layer 14, each second light converting layer24 and each third light converting layer 34. The backlight unit BU maygenerate the input light the same as the input light of the firstembodiment. For example, the backlight unit BU may include a pluralityof light emitting units of the first embodiment. In the embodiment, adisplay unit may include a light emitting unit, a portion of thecorresponding backlight unit BU, a portion of the corresponding lightmodulating layer LM, and a portion of the polarization layer PL. Theshift effect of first ratio, second ratio, and color hue (x-coordinatevalue, y-coordinate value) by those elements and layers may beignorable, and the dominant effective factor are the backlight unit andthe light converting layer. The output light could be regarded as thefinal visual light of the display device to the user (observer).

Refer to FIG. 15, which is a schematic diagram illustrating a displaydevice according to a variant embodiment of the second embodiment of thepresent disclosure. As shown in FIG. 15, as compared with the secondembodiment, in the display device 210 of this variant embodiment, thefilm F including the first light converting layers 14, the second lightconverting layers 24 and the third light converting layers 34 isdisposed between the backlight unit BU and the light modulating layerLM. Also, the first polarization layer PL1 is disposed between thebacklight unit BU and the light modulating layer LM, and the lightmodulating layer LM is disposed between the second polarization layerPL2 and the backlight unit BU. In the embodiment, a display unit mayinclude a light emitting unit, a portion of the corresponding backlightunit BU, a portion of the corresponding light modulating layer LM, and aportion of the polarization layer PL. The shift effect of first ratio,second ratio, and color hue (x-coordinate value, y-coordinate value) bythose elements and layers may be ignorable, and the dominant effectivefactor are the backlight unit and the light converting layer. The outputlight could be regarded as the final visual light of the display deviceto the user (observer).

In summary, the first ratio can be adjusted easily by the thickness ofthe first converting layer or the area of the second layer to be greaterthan 0% and less than or equal to 2.5% in the display device of thepresent disclosure, so that the color temperature of the display devicecan be easily adjusted to be substantially the same as the colortemperature generated from the TV, thereby improving the visualperception of the user and saving the manufacturing cost.

Those skilled in the art will readily observe that numerousmodifications and alterations of the device and method may be made whileretaining the teachings of the invention. Accordingly, the abovedisclosure should be construed as limited only by the metes and boundsof the appended claims.

What is claimed is:
 1. A display device, comprising: a display unit,comprising: a light emitting unit; wherein the display unit emits anoutput light under an operation of the highest gray level, the outputlight having an output spectrum, an intensity integral of the outputspectrum from 380 nm to 470 nm defines as a first intensity integral, anintensity integral of the output spectrum from 580 nm to 780 nm definesas a second intensity integral, a ratio of the first intensity integralover the second intensity integral defines as a first ratio, and thefirst ratio is greater than 0% and less than or equal to 2.5%.
 2. Thedisplay device of claim 1, wherein the output spectrum comprises a firstintensity peak and a second intensity peak, the first intensity peak isa maximum peak of the output spectrum from 380 nm to 470 nm, the secondintensity peak is a maximum peak of the output spectrum from 580 nm to780 nm, a ratio of the first intensity peak over the second intensitypeak defines as a second ratio, and the second ratio is greater than 0%and less than or equal to 5.5%.
 3. The display device of claim 1,further comprising a light converting layer disposed on the lightemitting unit, wherein at least a part of the light converting layeroverlaps the light emitting unit in a top view direction of the displaydevice.
 4. The display device of claim 3, wherein the light convertinglayer comprises a quantum dot material, a color filter material, or aphosphor material.
 5. The display device of claim 3, wherein the lightconverting layer further comprises a multilayer structure.
 6. Thedisplay device of claim 3, wherein the light converting layer furthercomprises at least one pigment material.
 7. The display device of claim3, wherein the light converting layer comprises a first layer and asecond layer, the second layer is disposed on the first layer, the firstlayer comprises a quantum dot material, and the second layer comprisesat least one pigment material.
 8. The display device of claim 1, whereinthe display unit is used as a sub-pixel.
 9. The display device of claim1, wherein the first ratio is less than or equal to 1.7%.
 10. Thedisplay device of claim 1, wherein the output spectrum comprises a firstintensity peak and a second intensity peak, the first intensity peak isa maximum peak of the output spectrum from 380 nm to 470 nm, awavelength of the first intensity peak ranges from 445 nm to 447 nm, thesecond intensity peak is a maximum peak of the output spectrum from 580nm to 780 nm, and a wavelength of the second intensity peak ranges from633 nm to 639 nm.
 11. A display device, comprising: a backlight unit; alight modulating layer disposed on the backlight unit; and a lightconverting layer disposed on the backlight unit, wherein a display unitcomprises a corresponding portion of the backlight unit, a correspondingportion of the light modulating layer, and a corresponding portion ofthe light converting layer, wherein the display unit emits an outputlight under an operation of the highest gray level, the output lighthaving an output spectrum, an intensity integral of the output spectrumfrom 380 nm to 470 nm defines as a first intensity integral, anintensity integral of the output spectrum from 580 nm to 780 nm definesas a second intensity integral, a ratio of the first intensity integralover the second intensity integral defines as a first ratio, and thefirst ratio is greater than 0% and less than or equal to 2.5%.
 12. Thedisplay device of claim 11, wherein the output spectrum comprises afirst intensity peak and a second intensity peak, the first intensitypeak is a maximum peak of the output spectrum between 380 nm to 470 nm,the second intensity peak is a maximum peak of the output spectrumbetween 580 nm to 780 nm, a ratio of the first intensity peak over thesecond intensity peak defines as a second ratio, and the second ratio isgreater than 0% and less than or equal to 5.5%.
 13. The display deviceof claim 11, wherein the light modulating layer is disposed between thebacklight unit and the light converting layer.
 14. The display device ofclaim 11, wherein the light converting layer is disposed between thebacklight unit and the light modulating layer.
 15. The display device ofclaim 11, wherein the light converting layer comprises a quantum dotmaterial, a color filter material, or a phosphor material.
 16. Thedisplay device of claim 15, wherein the light converting layer furthercomprises a multilayer structure.
 17. The display device of claim 15,wherein the light converting layer further comprises at least onepigment material.
 18. The display device of claim 11, wherein the lightconverting layer comprises a first layer and a second layer, the secondlayer is disposed on the first layer, the first layer comprises aquantum dot material, and the second layer comprises at least onepigment material.
 19. The display device of claim 11, wherein the firstratio is less than or equal to 1.7%.
 20. The display device of claim 11,wherein the output spectrum comprises a first intensity peak and asecond intensity peak, the first intensity peak is a maximum peak of theoutput spectrum from 380 nm to 470 nm, a wavelength of the firstintensity peak ranges from 445 nm to 447 nm, the second intensity peakis a maximum peak of the output spectrum from 580 nm to 780 nm, and awavelength of the second intensity peak ranges from 633 nm to 639 nm.